Arc lamp



Patented Oct. 4, 1932 PATENT OFFICE OTTMAR CONRADTY, OF'NUREMBERG, GERMANY ARC LAMP Application filed November 18, 1930, Serial No.

My invention relates to improvements in arc lamps, and more particularly in are lamps used in therapeutics and comprising a reflector, carbon electrodes within said reflector and series resistances.

this type the series resistances have been dis posed internally of the reflector so that the energy taken up by the said resistances is used for radiation. In such constructions 19 the dimension of the resistances must be small, so that in the operation of the radiation system the resistances are heated more or less to red heat. The .large amount of heat which is thus produced is reflected together with the light rays, which is desirable for the reason that the said heat rays have a beneflcent physiological and psychological influence. However, the heat radiation of the said resistances which by reason of their so small dimensions are heated to red heat is too high, and after a short time oftreatment the patient must be removed from the field of radiation because otherwise he would be endangered by the heat. Therefore either 23 radiation must be interrupted or the distance between thelamp and the patient must be enlarged. The enlarging of the said distance is objectionable for the reason that the efliciency of the ultra-violet rays is rapidly reduced as the distance between the patient and the source of radiation is increased. Therefore, if the source of radiation is located a large distance away from the patient, the radiation is weakened or made ineffective. 5 The heat rays are perceived even if they are located a greatdistance away from'the patient, who therefore has the impression of an eflective radiation, while as a matter of fact there is no radiation efiect.

10 The object of the improvements is to provide a system in which a part or all 'of the heating power of the resistances is made use of in which however the heat radiation of the said resistances is reduced so far that it is not 43 objectionable, and with this object in view I dispose the resistances on the outside of the reflector and so that its heat is transmitted to the metallic body of the reflector thus heating the same and causing the same to ema- 6 nate heat rays which are pleasing to the pa- In systems of 496,414, and in Germany November 18, 1929.

Fig. 4c is an elevation similar to the one' illustrated in Fig. 1 and showing the reflector retracted from the casing, and

Fig. 5 is an elevation showing a modification.

In the construction shown in Figs. 1 to 3 the metallic reflector a is disposed within a casing 0 having its frontpart made concave to accommodate the reflector. Within the reflector there are carbons shown conventionally at e, and the reflector is mounted on a link (Z tient without interfering with the proper its jointed to the bottom part of the casing c at f and permitting the reflector to be moved from the position shown in Fig. 2 outwardly and into the position shown in Fig. 3. The regulating resistances b are disposed outside the reflector a and within the casing 0 around the reflector so as to transmit the heat produced therein to the reflector. But the resistance may also be placed within the casing at opposite sides of the reflector, as is shown in Fig. 5.

In the operation the apparatus is used either in the position of the reflector a-shown in Fig.

. 2, or in the position of the reflector shown in Fig. 3 or with the reflector in an intermediate position, the said reflector being retracted from the casing more or less according to the desired degree of the heat.

be retracted from the casing c if increased heat radiation is unpleasant to the patient or undesirable for therapeutic reasons.

While in describingthe invention reference has been made to a particular example embodying the same. I- wish it to be understood that my invention is not limited to the con-v The reflector will struction shown in the figures and that various changes may be made in the general arrangement of the apparatus and the construction of its parts without departing from the W invention. For example, instead of disposing the resistances 6 within a casing c and on either side of the reflector, they may be coiled around the body of the reflector a. Further, instead of mounting the body of the reflector 0 a on a rockable arm (1! it may be slidably supported in suitable guide Ways.

I claim: 1. A therapeutical lamp, comprising supporting-means, arc-electrodes therefn, a reflec- 15 tor therefor, and a variable resistance mounted on said supporting-means, rearwardly of the reflector for heating the reflector, said refiector being movably mounted upon and connected to said support for swinging move- 90 ment toward and away from the same and the resistance to vary the heating effect thereby.

2. A therapeutical lamp, comprising a casing with a concave front, a reflector fitted into said concave front part of the casing, a Variable resistance located on the casing in a posi tion for directly heating the reflector, and means for supporting and connecting the reflector so that it can be swingably protruded from the casing and swingably retracted into 9 the casing.

In testimony whereof I hereunto affix my signature. OTTMAR CONRADTY. 

